... T/5minSELON SE-722 VISIBLE SPECTROPHOTOMETER, Wavelength setting, multi-point curve calibration Visible Spectrophotometer, portable spectrophotometer, spectrophotometerFEATURES:1, ... keyboard-input.2,Single-point curve calibration and multi-point curve calibration ( Up to 12 points).3,Curve fitting degree setting ... SELON SE-722 Visble Spectrophotometer, Wavelength setting, multi-point curve calibration